Abstract
An experiment was designed to assess the effect of altered growth potential (oestradiol status) on the response of intensively-reared steers to variations in UDP concentration. Observed growth responses were compared with those predicted by current protein evaluation schemes (ARC, 1980, 1984).Nine steers implanted with oestradiol -17β (‘Compudose 365’, Elanco Ltd) and nine non-implanted steers were fed on each of four diets from approximately 130 to 300 kg liveweight. The all-concentrate, iso-energetic diets used supplied a constant level of RDP slightly above that recommended by ARC (1980) and levels of UDP both above and below ARC (1980) recommendations (Table 1).Dry matter intake was recorded daily and liveweight weekly. The metabolisable energy system (MAFF, 1984) and the ARC (1980, 1984) protein evaluation system were applied to the feed intake and diet composition results recorded during the experiment in order to generate predictions of growth rate for each treatment which could then be compared with the observed growth rate.
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Schedule a callMore From: Proceedings of the British Society of Animal Production (1972)
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